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Complex and operatic both musically and lyrically, “Rhapsody,” like Led Zeppelin’s “Stairway to Heaven,” has attracted endless fan theories and interpretations. The surviving band members have claimed (in a leaflet included in their 2000 Greatest Hits) that the narrative is based on the Faust legend; critics have found possible sources in opera and Freddie Mercury’s personal biography; but like any good piece of art, it’s open to wide interpretation.

What is the last sentence referring to? Are the mentioned opera/biography verifying the claim about it being based on the Faust legend, or are they disagreeing about the claim? Is the opera mentioned just opera as a whole, or one specific opera? Also, which biography and what is it’s title?

If verifying, maybe the last sentence should be something like this

…on the Faust legend. Critics have found sources rectifying the band’s claim in opera {what opera? I don’t really understand what this is even referring to}, as well as Freddie Mercury’s personal biography, {biography name here + link}. Nonetheless, like any good piece of art, it’s open to wide interpretation.

If disagreeing make it something like this

…on the Faust legend. However, critics have found possible sources in opera {still don’t get what this is referring to in either context,} as well as Freddie Mercury’s personal biography, {biography name here + link}, disputing the band’s claims. Nonetheless, like any good piece of art, it’s open to wide interpretation.